These are replacement batteries for UB1280-F2 (D5779), BP7.5-12, YT-1270-F2, PS-1270-F2, NP7-12-F2 and GPL-1272. We supply only brand new, factory fresh, high quality batteries. We guarantee the best price and 100% compatibility with your Liebert GXT-2000RT-120B model. You must use the existing cables and hardware to connect your replacement ups batteries. The replacement sla batteries also include a minimum of one year warranty.